A null geodesic is both a null curve and a geodesic. In geometric optics, light rays follow null geodesics.
A radial null geodesic in a spherically symmetric spacetime has zero angular momentum and fixed angular coordinates. Its projection is a null curve of the two-dimensional radial Lorentzian metric.
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Incoming links (99)
- Born approximation in cosmological lensing
- Conformal optical metric for scalar perturbations
- Conjugate point to a spacelike surface
- First-order photon trajectory in scalar perturbations
- Future horismos
- Null-gradient affine-geodesic identity
- Null infinity
- Null pregeodesic
- Outgoing Eddington-Finkelstein coordinates
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- Past null infinity
- Photon sphere
- Radial null geodesics of the Vaidya metric
- Tortoise coordinate
- Tortoise coordinate of a five-dimensional charged black hole
- Vaidya metric
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